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<title>Search for etab decay into J/psi J/psi </title>
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<b>Search for &eta<sub>b</sub> decay into J/&psi J/&psi at CDF</b>
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This web page summarizes the results for the search of &eta<sub>b</sub> decay into J/&psi J/&psi, based upon 1.1 fb<sup>-1</sup> of data.<br>
The results have been approved as of June 15, 2006. 
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We measure:
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<ul>
<img src="etab_rel_cross_limit.gif">

</ul>
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Using the results from PRD71, 032001 (2005)<br>
<ul><img src="hb_crosssection.gif">,</ul>
it corresponds to <br>
<ul><img src="etab_cross_limit.gif">,</ul>

<h2>
A more detailed summary of the results can be found in this
<a href="etab_public_note.ps"> public note</a>.
</h2>
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    <img align=middle src="Etab_mass_UL.gif" > 
    <img align=middle src="etab_limit_vs_mass.gif" > 

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<hr>
<li> CDF Run I search results can be found at  <br>
[]CDF Collaboration, J. Tseng, in Proceedings of the 5th International Conference on Quark Confinement and the Hadron Spectrum V, edited by N. Brambilla and G. M. Prosperi (World Scientific, Singapore, 2003).
<!-- <a href="http://www-cdf.fnal.gov/cdfnotes/cdf5770_etab_jpsijpsi_v3_1.ps.gz">CDF note 5770</a>. -->
<br>
<ul>
  <li>7 candidates with 1.8 events are expected as background</li>
  <li>The statistical significance is 2.2 &sigma </li>
  <li>The production limit is set to be &sigma<sub>&eta<sub>b</sub></sub>(|y|<0.4) &middot Br(&eta<sub>b</sub>&rarr J/&psi J/&psi) &middot [Br(J/&psi &rarr &mu&mu)]<sup>2</sup> < 18 pb </li>
</ul>
</li>
<li> Recent Nonrelativistic QCD (NRQCD) calculations predict the production times branching fractions to be  Br&middot d&sigma/dy = 0.3 x 10<sup>&plusmn 1</sup> pb [1]. <br>
[1] <a href ="http://prola.aps.org/abstract/PRD/v63/i9/e094006">E. Braaten et al., Phys. Rev. D 63, 094006 (2001) </a>
<br>
<br>
<li> The mass splitting between &eta<sub>b</sub> and &Upsilon(1S) is estimated to be 30 - 160 MeV range. [2-8] </li>

[2] <a href="http://link.aip.org/link/?&l_creator=getabs-normal&l_dir=FWD&l_rel=CITES&from_key=PRVDAQ000070000005054014000001&from_keyType=CVIPS&from_loc=AIP&to_j=PRVDAQ&to_v=49&to_p=5845&to_loc=APS&to_url=http%3A%2F%2Flink.aps.org%2Fabstract%2FPRD%2Fv49%2Fp5845">E. J. Eichten and C. Quiggs, Phys. Rev. D 49, 5845 (1994)</a><br>

[3] <a href="http://link.aip.org/link/?&l_creator=getabs-normal&l_dir=FWD&l_rel=CITES&from_key=PRVDAQ000070000005054014000001&from_keyType=CVIPS&from_loc=AIP&to_j=PRVDAQ&to_v=65&to_p=074508&to_loc=APS&to_url=http%3A%2F%2Flink.aps.org%2Fabstract%2FPRD%2Fv65%2Fe074508">X. Liao and T. Manke, Phys. Rev. D 65, 074508 (2002)</a><br>

[4] <a href="http://link.aip.org/link/?&l_creator=getabs-normal&l_dir=FWD&l_rel=CITES&from_key=PRVDAQ000070000005054014000001&from_keyType=CVIPS&from_loc=AIP&to_j=PYLBAJ&to_v=578&to_p=369&to_loc=DOI&to_url=http%3A%2F%2Fdx.doi.org%2F10.1016%2Fj.physletb.2003.10.070">S. Recksiegel and Y. Sumino, Phys. Lett. B 578, 369 (2004)</a><br>

[5] <a href="http://link.aip.org/link/?&l_creator=getabs-normal&l_dir=FWD&l_rel=CITES&from_key=PRVDAQ000070000005054014000001&from_keyType=CVIPS&from_loc=AIP&to_j=PRVDAQ&to_v=67&to_p=014027&to_loc=APS&to_url=http%3A%2F%2Flink.aps.org%2Fabstract%2FPRD%2Fv67%2Fe014027">D. Ebert, R. N. Faustov, and V. O. Galkin, Phys. Rev. D 67, 014027 (2003)</a><br>

[6] <a href="http://link.aip.org/link/?&l_creator=getabs-normal&l_dir=FWD&l_rel=CITES&from_key=PRVDAQ000070000005054014000001&from_keyType=CVIPS&from_loc=AIP&to_j=EPCFFB&to_v=21&to_p=355&to_loc=EDP&to_url=http%3A%2F%2Fpublish.edpsciences.com%2Fabstract%2FEPJC%2Fv21%2Fp355">V. Lengyel, Y. Fekete, I. Haysak, and A. Shpenik, Eur. Phys. J. C 21, 355 (2001)</a><br>

[7] <a href="http://link.aip.org/link/?&l_creator=getabs-normal&l_dir=FWD&l_rel=CITES&from_key=PRVDAQ000070000005054014000001&from_keyType=CVIPS&from_loc=AIP&to_j=PRLTAO&to_v=92&to_p=242001&to_loc=APS&to_url=http%3A%2F%2Flink.aps.org%2Fabstract%2FPRL%2Fv92%2Fe242001">B. A. Kniehl, A. A. Penin, A. Pineda, V. A. Smirnov, and M. Steinhauser Phys. Rev. Lett. 92, 242001 (2004)</a><br>

[8] <a href="http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRVDAQ000070000005054014000001&idtype=cvips&gifs=yes">F. Maltoni and A. D. Polosa, Phys. Rev. D 70, 054014 (2004)</a>
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<br>
<li> Some other references : </li>
<li> Measurement of the J/&psi Meson and b-Hadron Production Cross Section in pp collisions at &radic s = 1960 GeV,<br>[9] <a href="http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRVDAQ000071000003032001000001&idtype=cvips&gifs=yes">D. Acosta et al., Phys. Rev. D 71, 032002 (2005) </a> </li>
<li> Upsilon Production and Polarization in pp Collisions at &radic s = 1.8 TeV<br> [10]<a href ="http://prola.aps.org/abstract/PRL/v88/i16/e161802"> D. Acosta et al., Phys. Rev. Lett. 88, 161802 (2002) </a> </li>

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Below are the eps or gif versions of all figures meant for downloads.
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<ul>
  <li> Table 1 : J/&psi yield table for inclusive and B for full data set <a href=yield_full.gif> [gif] <br><img src="yield_full.gif" height=200> </a> </li>

  <li> Table 2 : Systematics table in <a href=table_systematics.jpg> [jpg] </a> and <a href=table_systematics.png> [png] <br><img src="table_systematics.png" height=150></a> </li>

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  <li> Figure 1 : J/&psi mass spectrum and projection from ML fit for 3.0 < Pt < 3.25 GeV, in <a href=jpsi_fit_mass_7.eps>[eps]</a> and <a href=jpsi_fit_mass_7.gif>[gif]<br><img src="jpsi_fit_mass_7.gif" width=200></a> </li>

  <li> Figure 2 : J/&psi mass spectrum and projection from ML fit for 3.0 < Pt < 3.25 GeV, in <a href=jpsi_fit_life_7.eps>[eps]</a> and <a href=jpsi_fit_life_7.gif>[gif]<br><img src="jpsi_fit_life_7.gif" width=200></a> </li>

  <li> Figure 3 : differential J/&psi yield vs pt in <a href=yielddpt_pt.eps>[eps]</a> and <a href=yielddpt_pt.gif>[gif]<br><img src="yielddpt_pt.gif" width=200></a> </li>
  <li> Figure 4 : J/&psi mass fit for 50 < Pt < 70 GeV events in <a href="jpsimass_50GeV.eps">[eps]</a> and <a href="jpsimass_50GeV.gif">[gif]<br><img src="jpsimass_50GeV.gif" width=200></a> </li>


  <li> Figure 5 : &eta<sub>b</sub> mass spectrum in <font face="Helvetica" color="#990000"> SEARCH </font> analysis <a href=Etab_mass_3mu1tr.eps>[eps]</a> and <a href=Etab_mass_3mu1tr.gif>[gif]<br><img src="Etab_mass_3mu1tr.gif" width=200></a> </li>

  <li> Figure 6 : &eta<sub>b</sub> significance scan in <font face="Helvetica" color="#990000"> SEARCH </font> analysis <a href=signif_scan_3mu1tr.eps>[eps]</a> and <a href=signif_scan_3mu1tr.gif>[gif]<br><img src="signif_scan_3mu1tr.gif" width=200></a> </li>
  
  <li> Figure 7 : &eta<sub>b</sub> mass spectrum in <font face="Helvetica" color="#990000"> UL </font> analysis <a href=Etab_mass_UL.eps>[eps]</a> and <a href=Etab_mass_UL.gif>[gif]<br><img src="Etab_mass_UL.gif" width=200></a>  </li> 

  <li> Figure 8 : &eta<sub>b</sub> 95% CL excluded yield limit in <a href=etab_limit_vs_mass.eps>[eps]</a> and <a href=etab_limit_vs_mass.gif>[gif]<br><img src="etab_limit_vs_mass.gif" width=200></a>  </li> 
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